/*
 * WRMRootSetProvider.java   0.0.1    Dec 4, 2009
 * 
 * Copyright (c) 2009 mentalsmash.org
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of the Apache License does not indicate that this project is
 * affiliated with the Apache Software Foundation.
 */
package org.mentalsmash.tazio.transactions.management.wrm;

import org.mentalsmash.tazio.cache.Cache;
import org.mentalsmash.tazio.cache.NoSuchCachedObjectException;
import org.mentalsmash.tazio.transactions.TransactionalSystemRuntimeException;
import org.mentalsmash.tazio.transactions.objects.RootSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.Inject;
import com.google.inject.Provider;

/**
 * @version 0.0.1 Dec 4, 2009
 * @author Andrea Sorbini <as@mentalsmash.org>
 * 
 */
public class WRMRootSetProvider implements Provider<RootSet> {

    private final static Logger log = LoggerFactory
	    .getLogger(WRMRootSetProvider.class);
    private final Cache localChache;

    @Inject
    WRMRootSetProvider(Cache localChache) {
	this.localChache = localChache;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.google.inject.Provider#get()
     */
    @Override
    public RootSet get() {
	try {
	    return (RootSet)localChache.getObject(RootSet.ROOT_SET_OID);
	} catch (NoSuchCachedObjectException e) {
	    log.error("Unable to retrieve root set!");
	    throw new TransactionalSystemRuntimeException(
		    "Unable to retrieve RootSet", e);
	}
    }

}
